Structural Properties of Copper Zinc Oxide Nanoparticles Prepared from Solid State Reaction
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Abstract
Local structure of copper zinc oxide nanoparticles synthesized from single step solid state synthesis was investigated. The phase structure of the copper zinc oxide nanopowder product was confirmed by X-ray powder diffraction (XRD). The particle size and morphology were investigated by field emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM). Short range crystal fine structure was investigated by X-ray absorption spectroscopy (XAS). The result demonstrates that the Cu atom probably substitutes in Zn site of ZnO wurtzite host. The second phase of CuO nanocluster was presented in the Cu doped ZnO structure as the Cu concentration is in the range of 10 and 50 %mole. The radial distribution functions in short range order from Zn atom, points to a high concentration of O and Zn vacancies in all samples which correlates with the distortion of local symmetry ZnO cluster compared with ZnO standard. A higher disorder corresponds to the interpreted XRD result in terms of crystallinity degree which is likely originated by a disorder of surface and interface effect. The prepared sample with 1.0 mol% Cu shows smaller particle size with highly distorted ZnO cluster and high O and Zn vacancies. These copper zinc oxide nanoparticles with high active surface and high phase interface could be feasibly promising material in many applications.
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